Heatless Regenerative Desiccant Air Dryer | AHLD Series
17
MAINTENANCE
Maintenance
Prior to performing and maintenance on the dryer, all
personnel are strongly advised to familiarize themselves
with the equipment by reading the entire contents of
this operation manual. Aircel strongly recommends the
strict adherence of all the safety procedures prior to any
performing and maintenance activity on the dryer.
1. The pressure differential indicator referred to as the
“Delta-P” is a very good indicator of the state of the filter
elements. Maintenance personnel must pay attention
to these to keep the drying running with full efficiency
Change filter elements on a regular basis, once a year
maximum for a 1-shift operation. Change more frequently
if operating 2 or 3 shifts such as every 6 months.
2. The useful life of a filter element depends on the quality
of air. Free open areas for input and exhaust will ensure
lesser intake of dirt and particles.
3. Powder desiccant can accumulate in the muffler and
increase the backpressure in the regenerating tower
change mufflers on a regular basis typically every 2-3
months for optimum performance.
4. Oil and oil vaper can drastically reduce the life of the
desiccant. Take precautions to eliminate all traces of oil
from the airflow.
5. Fluctuating dew point indicates uneven drying and
regeneration between the towers, an exhaust valve may
not be working properly or muffler may be clogged or
dirty, also vessel diffuser screen may be clogged.
Weekly Checklist
1. Check all drain valves, prefilter, afterfilter and separators.
2. Check any pressure differential indicators (Delta-P) on
the pre-filter and afterfilter (filter elements should still be
changed on regular basis once a year maximum for a 1
shift operation. Change more frequently if operating 2 or
3 shifts such as every 6 months).
3. Check dryer for correct operation.
4. Verify dryer is purging at the purge exhaust, after dryer
depressurizes.
5. Check the dew point (if available) to ensure the dew point
is being achieved.
6. Check back pressure in regenerating tower, if more than a
few psig on the pressure gauge, clean or replace exhaust
mufflers (change mufflers on a regular basis typically
every 2-3 months for optimum performance).
Semi-Annual Checklist
1. Remove and inspect all filters for excessive particulate
loading and physical damage – if required replace
prefilters, afterfilters, pilot air filter and mufflers (filter
elements should still be changed on regular basis once
a year maximum for a 1 shift operation. Change more
frequently if operating 2 or 3 shifts such as every 6
months).
2. Check pressure differential indicator and if it turns red,
replace the element.
3. Remove exhaust mufflers. Knock out excess particulate
and back flow with dry compressed air. If particulate
cannot be removed completely change the exhaust
mufflers. Check backpressure in regenerating tower,
if more than a few psig on the pressure gauge, clean
or replace exhaust mufflers. (Change mufflers on a
regular basis typically every 2-3 months for optimum
performance).
4. Check desiccant condition. Powder in the mufflers is an
indication of the status of the desiccant.
5. Check all solenoid valves – coil condition and control
circuit.
6. Check dryer operation.
7. Inspect and clean inlet and outlet APV (Automatic Piston
Valves).
Annual Checklist
1. Replace elements in prefilters, afterfilters, and pilot air
filter.
2. Replace mufflers.
3. Recalibrate dew point analyzer probe (if used) or send
back to factory for recalibration.
4. Check inlet and outlet valve seals. Clean or replace as
needed.
5. Check dryer for proper operation
WARNING!
• Follow any proper lock out/tag out procedure
before performing service or maintenance work.
• Follow all safety procedures prior to performing any
maintenance activiting on the dryer.
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